Owners of budget smartphones like the Xiaomi Redmi 9A often face the need to expand internal memory. Installing a microSD memory card is the most affordable way to solve the problem of lack of space for photos, videos and documents. However, modern versions of the Android operating system and the MIUI shell implement strict security protocols that by default block direct access to external drives.
When you insert a flash drive and try to open the Gallery app, you may find that your old pictures are in place but the new files or card contents are not displayed.The system requires explicit confirmation from the user so that the application gains read and write rights.Without this step, the file system remains hidden to viewers.
In this article, we will take a closer look at how to activate the card correctly, where to look for hidden permission switches, and what to do if the standard method fails, and this guide will help you to fully harness the potential of your device without losing important data.
Preparation of memory card and initial installation
Before you configure software permissions, you need to make sure that the physical serviceability of the media and the correct installation. Redmi 9A supports cards up to 512 GB, but for stable operation it is recommended to use media of a speed class not lower than Class 10. If the card is new or previously used in another device, it is better to format it.
Put the card in the tray for SIM-The system automatically detects a new storage device when the smartphone is turned on, a pop-up notification appears on the screen, and you can't ignore it, because that's when the partition is first mounted.
- ✅ Check that the microSD card is inserted before clicking in the tray.
- ✅ Make sure the card contacts are clean and have no oxides.
- ✅ Reboot the smartphone after installation, if no automatic determination has occurred.
It's important to note that the formatting process will destroy all the data on the media. If there's important information on the map, copy it to your computer before you install it on your phone. Once formatted, the system will create the necessary structure for Android/data and Android/obb folders, without which applications will not be able to properly work with external storage.
⚠️ Note: Do not remove the memory card while actively writing data or operating the system.This can lead to logical errors of the file system and loss of access to media files.
☑️ Checking the map's readiness
Main method: activation through system notification
The most common scenario that Redmi 9A users face is when they first start the Gallery or Explorer app after installing the map. Android 10 and higher security mechanism (which runs MIUI 12) requires manual confirmation.
Usually, a dialog box appears on the screen with text like “Allow access to files on the device?” or “Requires access to files on the device.” SD-This window will have a "Allow" or "OK" button, and pressing this button will give the app access to the external drive root directory token.
Sometimes the window may not appear immediately, so try opening a photo folder or running a video, and the system will force you to request permissions when you try to access an external storage, and if you accidentally click "Cancel," don't panic, you can manually issue permission through settings.
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If the system window does not appear, try to switch mode. USB-Connecting the notification curtain from Charging Only to File Transfer and then back again, sometimes triggering a repository survey.
Once validated, the permissions are saved, and applications can not only read, but also write data, delete files, and create new folders, which is critical for cameras, voice recorders, and instant messengers, which by default tend to store cache and media on an external card to save internal memory.
Manual setting of rights through the application menu
If the automatic request does not appear or is lost, you need to manually check the permission settings for a particular application. In the MIUI shell, this process may be slightly different from standard Android, but the logic remains the same. You will need access to the application management section.
Go to the Settings menu, then select the App and then All Apps. In the list, look for Gallery (or Explorer if you have a file problem). Click on the app name to open the properties page. Here we are interested in App Permissions.
| Type of permit | Default status | Recommended action |
|---|---|---|
| Memory (Files) | Ask/Forbidden | Permission. |
| Camera. | Permitted. | Leave it unchanged. |
| Microphone | Forbidden. | If necessary, |
| Contacts | Forbidden. | Ban (for gallery) |
In the permission list, find the item associated with memory, which can be called "Memory", "Files and Media" or "Access to Storage." Click on it and select the "Allow" option. Some versions of MIUI require you to additionally turn on the "Change and Delete" switch.
After making the changes, be sure to close the app completely. To do this, swipe from the bottom up, hold your finger on the Menu button (or swipe up the central navigation button) and close the Gallery. The re-start should be successful, and the files on the map will become visible.
Use of the Explorer application for access control
The standard Gallery app in Xiaomi Redmi 9A sometimes works unstable with external large drives. In such cases, the File Manager system is the more reliable tool. It has deeper access rights and can often “wake up” the memory card, making it visible to other programs.
Run the Explorer app. If the map is installed correctly, you'll see it in the storage list, usually marked as «SD-card" or has a volume other than internal memory. Click on the card icon. If access is restricted, the system will again request permission - confirm it.
Through the conductor, you can perform basic operations that will help the system index files:
- 📂 Create a new folder on the memory card (for example, “Test»).
- 📄 Copy any small file from internal memory to a map.
- 🗑️ Delete the created test file.
This action forces the Android media scanner to rescan the external drive's file table, then restart the Gallery. Often, images that have not previously been displayed appear after this forced indexing, which is especially true for DCIM and Pictures folders.
⚠️ Note: When deleting files through Explorer, make sure you are on the right site. SD-map, not in internal storage, so as not to accidentally delete system data.
Android 11/12 and Scoped Storage
Users who upgrade Redmi 9A to newer versions of Android may encounter the concept of Scoped Storage, which isolates app data from each other, and the gallery no longer has automatic access to the entire map, but only to its own folders.
If you use a third-party gallery (such as Google Photos or Simple Gallery), it may need special access through the document selection system interface. When requesting permissions, the manager system file window will open. At the top of this window, there is often a button or menu (three dots) where you need to select "Show the root directory" or a similar item.
Then you press the blue "Use this folder" button and confirm the action in the "Allow" pop-up window, which gives the application recursive access to all the nested directories on the Internet. SD-Without this step, the app will only see the void or its own service files.
Why are new versions of Android restricting access?
In some cases, cleaning the cache of Media Storage helps. It's the system process that indexes files. Go to Settings → Apps → Show all apps → (three dots in the corner) → Show system processes. Find Media Storage, click Clear, and select Clear Everything. After rebooting, the phone will scan the map again.
Diagnostics and Solving Typical Errors
Even after all the permits are granted, there can be situations where files are not read or the card is identified as corrupt.The first step should always be to check the physical condition.Try to remove the card, wipe the contacts with soft cloth and insert again. SIM-maps are tightly closed.
If the system writes «SD-card corrupted" or suggests formatting it again, perhaps the file system has received errors. USB-In the file transfer mode» (MTP) Check if the computer sees the map, and if so, copy the data to your PC and format the map to exFAT or FAT32 computer.
A common mistake is to use low-quality cards; budget-based card models may not be able to handle the speed of modern smartphone cameras; if a card is constantly falling off or glitching after approvals are issued, it is likely to be exhausted or fake.
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If the memory card is not identified after formatting on the computer and re-installing it in the phone, the probability of its physical failure is high.
It's also worth checking if the storage is crowded. Sometimes the system doesn't have a few megabytes to create temporary indexing files, which blocks access to the rest of the content. SD-map.